Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42B02SW00007

Record: MDI42B02SW00007

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Copper

Location

Township or Area: Hellyer

Latitude: 48° 0' 13.33"    Longitude: -82° 46' 42.15"

UTM Zone: 17    Easting: 367352.96   Northing: 5318242    UTM Datum: NAD83

Resident Geologist District: Timmins

NTS Grid: 42B02SW

Point Location Description: Outcrop on east side of a short steep hill with strong carbonate alteration

Location Method: Field Visit with GPS

Access Description: New, secondary logging roads, emanating from the Hellyer main haul road to the west, roughly follow the old Keevil base line to within 200 m of the main pyritic trenches.

Exploration History

1964: Keevil Mining - ground magnetic, VLFEM, self potential geophysical surveys, geological mapping, trenching. 2011: Platinex Inc. - till sampling (geochemistry). 2012-13: Probe Mines Ltd. - DD-17-3809 m

Assessment Work on File

Geology

Province: Kapuskasing Structural Zone

Geological Age: Neoarchean  

Lithology

Lithology Comments

Nov 12, 2013 (A Wilson) - Mineralization has been intermittently found over several kilometres in a gneissic sequence trending east-west. There are a variety of medium to coarse grained gneisses with variable hornblende and biotite concentrations which are probably derived from supracrustal rocks and in some rare instances, gabbroic intrusions. Within the gneisses, there is a banding developed. In the low mafic, granitic gneisses (<5% mafic) the banding is typically on the centimetre scale caused by mafics concentrated in millimetre thick horizons. In the high mafic, hornblende gneisses, (30-40% mafics) banding is commonly on the 10 to 20 cm scale though there are closely spaced, thin trails of quartz and feldspar parallel to the compositional banding. quartz-feldspar pegmatite neosome is more common in the hornblende gneisses as the garnets, which form 5 to 10% of the rock. These gneisses are interbanded and probably are derived from supracrustal rocks. Locally, there are massive, medium to coarse grained amphibolites composed entirely of hornblende. This rock may be derived from mafic intrusives. At the eastern end of the old grid there is a strongly altered, fine-grained, massive volcanic rock devoid of any indications of the regional amphibolite facies metamorphism. This unit is an island in the surrounding gneissic rocks. Further to the west of the position located there are other occurrences of this rock type in narrow dikes. The Probe drill program intersected mineralogically similar rock units to those present in the main Borden Lake Project area including amphibolite, felsic gneiss and amphibole gneiss. However there are differences in that the amphibolite contains more garnet than is typically observed at Borden Lake and the amphibole gneiss contains more biotite than typically observed at Borden Lake. Additionally, more developed gneissic banding is observed.

Mineralization

Mineralization Comments

Nov 12, 2013 (A Wilson) - The reported mineralization consists of massive pyritic and magnetite rich bands up to 1.5m thick hosted in granitic gneisses. The pyrite in these bands is fine-grained and the bands were found intermittently over several kilometers west of the given location. Grab samples taken by the OGS in 1992 returned values of 0.0097% Cu and 0.0172% Zn. Generally low gold grain counts in tills in the area (0-1 grain per 10kg) had tended to reinforce that view. The current test program of till sampling obtained significantly better results than the regional background averages. The thirteen samples on average contained 2.4 grains per 10 kg (normalized) with a high of 6 grains in two samples. Pristine gold grains were evident in samples with up to 5.2 grains per 10 Kg (normalized).

Assay Samples

Mineral Record Details

Mineral Zones - Size and Shape

Rank: 1       Structure Type: None

Site Visit Information

Date: Oct 12, 2001

Geologist: D Draper

Notes: Second trip was made to check on the carbonatite occurrences after recent logging operations. From this trip it observed that the carbonatites also occur in dykes. It may be a possibility that the focus of the earlier trenching was the carbonatite dykes which were taken as sulphide zones. (Fumerton field visit)

Date: Oct 16, 2001

Geologist: D Draper

Notes: [Fumerton visit notes]: Second trip was made to check on the carbonatite occurrences after recent logging operations. From this trip it observed that the carbonatites also occur in dykes. It may be a possibility that the focus of the earlier trenching was the carbonatite dykes which were taken as sulphide zones.

References

Map - Chapleau-Foleyet, geological compilation series, Algoma, Cochrane and Sudbury districts

Publication Number: M2221 Scale: 1:253,440    Date: 1976

Author: Thurston P.C., Sage R.P., Siragusa G.M.

Publisher Name: Ontario Division of Mines

Location:

MonoMap - Geology of the Chapleau area, districts of Algoma, Sudbury, and Cochrane

Publication Number: R157 Scale:     Date: 1977

Author: Thurston P.C., Siragusa G.M., Sage R.P.

Publisher Name: Ontario Division of Mines

Location:

MonoMap - Mineral Prospects of the Swayze Greenstone Belt (Volume 1, Parts of NTS 41 O and Volume 2, Parts of NTS 41 P, 42 A and 42 B)

Publication Number: OFR5912 Scale:     Date: 1995

Author: Fumerton S.L., Houle K.A.

Publisher Name: Ontario Geological Survey

Location:

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For detailed information regarding this mineral record please contact the Timmins Resident Geologist District Office